Five breaches of Covid-19 guidelines have been identified by RTE following a Health and Safety Review into a retirement gathering at the station.
It found there were three breaches of the COVID-19 public health advice, one breach of Level 5 restrictions and a breach in RTÉ's internal protocols.
The review makes a number of recommendations including that all present at the gathering retake RTÉ's COVID-19 induction training.
The national broadcaster says it will implement the findings in full.
Bryan Dobson, Miriam O'Callaghan, David McCullagh and Eileen Dunne were among those who apologised for attending the event.
They were photographed in close proximity with others, with little social distancing and no masks worn.